Food is essential for survival, but water is even more important. But how do you survive if your only source of water is, say, filthy river water? One option is a pocket water filter – such as a http://www.umbriameteo.com/index.php/carriage-of-goods-by-sea/ filter. Another option: a solar water filter made out of two water bottles and a small PCV pipe. It could come in handy if you forget your pocket water filter or left it at home.
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